Improvement in pipe-wrenches



UNITEDSTAT'ES PATENT OFFICE.

ROYAL R. PIPER, OF EAST SAGINAW, MICHIGAN.

IMPROVEMENT IN PlPE-WRENCHES.

Specification forming part of Letters Patent No. 219,758, datedSeptember 16, 1879; application filed March 12, 1879.

To all whom it may concern:

Be it known that I, ROYAL R. PIPER, of East Saginaw, in the county ofSaginaw and State of Michigan, have invented a new and usefulImprovement in Pipe -Wrenches, of which the following is aspecification.

My inyention relates to that class of pipewrenches in which a chain isemployed in connection with a serrated jawand a handle or lever.

The invention consists in a novel construction, combination, andarrangement, with relation to each other, of the jaw and its handle blelength, and in one piece with the jaw B,

the biting surface orface of which is inclined ata suitable angle, andfurnished with serrations 1).

A short distance above the serrations is a hole, through which passes abolt, 0, which holds in place a swinging link or stirrup, C. To thislink or stirrup is attached one end of a chain, D, to'the other end ofwhich is attached a bifurcated curved bar, E, in which are perforationse, for the reception of a locking-pin, G.

On the jaw 13, at or near the point Where the handle begins, is a loopor keeper, H, which receives the smaller end of a tapering or wedgeshaped key, J. This handle (see Fig. 3) has on one side a noteh i, of asize suitable for the engagement of the locking-pin G.

The pin G is split and elastic, so that when in position in theperforations e the split ends will spring outward and prevent it frombeing accidentally displaced.

In using this wrench the serrated surface of the jaw B is placed againstthe surface of the pipe to be turned, as shown in dotted lines, and thechain D is passed around said pipe. The perforated curved bar E is thenplaced so that its two branches will pass on either side of the jaw B,below the loop or keeper H. The key J is then placed in position, lyingagainst the edge of the j aw B between the two branches of the bar E,with the smaller end of the bandle inserted in the loop or keeper H. Thelocking-pin G is then passed through the perforations e, and alsothrough the notch z'of the key J. By this means the parts are heldfirmly in position and prevented from displace-' ment; and when thehandle is moved to turn the pipe the serrated jaw is enabled to take afirm hold, and is effectually prevented from slipping.

When it is desired to use this wrench on galvanized or polishedsurfaces, a strip of leather or other material may be interposed betweenit and the work, in order to prevent the marring of the surface. a

Having thus described my invention, I claim as new and desire to secureby Letters Patent The combination of the correspondinglynotched handle Aand key J, the bolt 0, chain D, perforated bar E, and loop H, as shownand described.

ROYAL R. PIPER.

WVitnesses:

A. J. DENTON, J. INGLEHART.

